<template>
    <router-view></router-view>
</template>

<script>
export default {
  name: 'app',
  created () {
    // 在页面加载时读取sessionStorage
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(Object.assign({}, this.$store.state, JSON.parse(sessionStorage.getItem('store'))))
    }
    // 在页面刷新时将store保存到sessionStorage里
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state))
    })
  }
}
</script>

<style>
</style>
